Preparation method of nano silver suspending liquid
A technology of suspension and nano-silver, which is applied in botany equipment and methods, animal repellants, biocides, etc., can solve the problems of long production cycle, wide distribution, and reduced particle growth rate, and achieve low production cost and high application Wide area and high sterilization efficiency
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[0010] As shown in Figure 1, the reduction method and the complex method are used to prepare the nano-silver suspension. The raw materials used are ammonia, purified water, and silver nitrate (99.999%). The preparation method is: first mix and dilute silver nitrate with purified water Into the usable silver nitrate aqueous solution, and then press silver nitrate 0.15-4.8 (weight): 1-3.5 (volume) concentrated ammonia water (complexing agent) into the silver nitrate aqueous solution within a certain period of time to carry out the silver ammonia complex reaction And ion coordination, and then the mixed solution is heated in stages to remove ammonia to obtain an aqueous suspension of spherical nano-particles, in which the silver content ranges from 5 to 1000 ppm, and the silver particle size is from 0.1 to 20 nm.
[0011] The heating and ammonia removal process is carried out in stages, at least twice.
[0012] Sterilization experiments were performed on the nano-silver suspension pr...
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